package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
//    @Autowired
//    CategoryDao categoryDao;

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2、组装成父子的树形结构
        //2.1)、找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity -> categoryEntity.getParentCid() == 0
        ).map(menu->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
//        }).sorted((menu1,menu2)-> (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort())
        }).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort()))
        ).collect(Collectors.toList());


        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1、检查当前删除的菜单，是否被其他地方引用

        //逻辑删除----假删除   application.yml中配置的logic-delete-value属性
        baseMapper.deleteBatchIds(asList);
    }


    //[2,25,225]
    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths= new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);
        return parentPath.toArray(new Long[parentPath.size()]);
    }


    /**
     * 级联更新所有关联的数据
     * @param category
     */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        //1、收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    /**
     * 递归查找所有菜单的子菜单
     * @param root   一级（根菜单）
     * @param all  全部菜单
     * @return
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity ->  categoryEntity.getParentCid() .equals( root.getCatId())
//        List<CategoryEntity> children = all.stream().filter(categoryEntity ->  categoryEntity.getParentCid() == root.getCatId()//会出现二级菜单中为空无法新增三级菜单的问题
        ).map(categoryEntity -> {
            //1、找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
//        }).sorted((menu1,menu2)-> (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort())//2、菜单的排序
          }).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort()))//2、菜单的排序
        ).collect(Collectors.toList());

        return children;
    }

}